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Which phenomenon results when a laser's temporal coherence degrades?

A)Increased linewidth in the spectral output
B)Higher overall output beam intensity
C)Better focusing at longer distances
D)Reduced speckle in reflected light

💡 Explanation

Degraded temporal coherence leads to lasers emitting a wider range of frequencies; this is because the interference fringes broaden, so the linewidth increases rather than cleaner monochromatic output, as high coherence yields, therefore the spectral bandwidth will increase rather than decrease.

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